Help needed with merging two CSV files

[bowlofred]

What do you want to do with column 257, just ignore it?

If so, I'd probably do something like this:

import csv

with open("File1.csv") as in1, open("Filie2.csv") as in2, open("Result.csv", "w") as out:
    writer = csv.writer(out)

    for row in csv.reader(i1):
        writer.writerow(row[:256])
    for row in csv.reader(i2):
        writer.writerow(row[:256])